48. If (a,0) is a point on a diameter of the circle x²+y²=4 then x²-4x-a²=0 must have : A. Exactly one real root in [-9/10,1/10] B. Exactly one real root in [4,49/10] C. Exactly one real root in [0,2] D. Two distinct real roots in [-1,5]

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